LOCTITE SF770
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- Cyanoacrylate Adhesion Primer
- Low-Surface-Energy Plastic Bonding
- 8 to 9-Second Dry Time
Product Description
LOCTITE® SF 770 is a cyanoacrylate surface primer specifically formulated to improve adhesion on difficult-to-bond, low surface energy plastics such as polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), and thermoplastic rubber materials. The primer modifies the surface characteristics of these substrates, enabling LOCTITE® cyanoacrylate adhesives to achieve substantially improved bond performance. It is recommended only for low-energy plastics and can be detected under UV light after application.
Key Features & Benefits
- Surface primer for cyanoacrylate adhesives.
- Improves bonding to low surface energy plastics.
- Suitable for polyethylene, polypropylene and PTFE.
- Very low viscosity for uniform surface coverage.
- Fluoresces under UV light for inspection.
- Can be applied by spray, brush or dipping methods.
- Extends cyanoacrylate bonding capability to difficult substrates.
Recommended Applications
- Polyethylene component bonding.
- Polypropylene assembly applications.
- PTFE bonding preparation.
- Thermoplastic rubber bonding.
- General low-energy plastic surface preparation.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
Transparent to slightly hazy liquid
Appearance at room temperature.
Specific Gravity
0.87
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
Physical Properties
Viscosity
0.82 mPa.s
Viscosity is a measurement of a fluid’s resistance to flow.
Viscosity is commonly measured in centiPoise (cP). One cP is defined as
the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP.
A product like honey would have a much higher viscosity -around 10,000 cPs-
compared to water. As a result, honey would flow much slower out of a tipped glass than
water would.
The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application
Additional Information
Technical Properties
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Technology | Primer for Cyanoacrylate | — | CA surface primer |
| Chemical Type | Aliphatic Amine | — | Active primer chemistry |
| Solvent | Isopropyl Acetate | — | Carrier solvent |
| Appearance | Transparent to Slightly Hazy Liquid | — | As supplied |
| Fluorescence | Positive Under UV Light | — | Inspection aid |
| Specific Gravity | 0.87 | — | 23°C |
| Viscosity | 0.62 | mPa·s (cP) | Cone & Plate, 25°C |
| Drying Time (Steel) | 9 | seconds | 23°C |
| Drying Time (Polypropylene) | 9 | seconds | 23°C |
| Drying Time (Polyethylene) | 8 | seconds | 23°C |
| On-Part Life | 8 | hours | Typical |
Technical Properties
After-Processing / Final-State Properties
| Property | Value | Unit | Condition / Method |
|---|---|---|---|
| Block Shear Strength (PP + LOCTITE® 406) | 15 | N/mm² | ISO 13445, 24 h cure @ 23°C |
| Block Shear Strength (PP + LOCTITE® 496) | 4.8 | N/mm² | ISO 13445 |
| Block Shear Strength (PP + LOCTITE® 460) | 13 | N/mm² | ISO 13445 |
| Block Shear Strength (Acetal + LOCTITE® 406) | 14 | N/mm² | ISO 13445 |
| HDPE to Mild Steel (LOCTITE® 406) | 15 | N/mm² | Primer on HDPE |
| Polypropylene to Polypropylene (LOCTITE® 406) | 13 | N/mm² | Primer on polypropylene |
| Water Resistance | 100% | Strength Retention | After 1000 h water exposure |
| Humidity Resistance | 100% | Strength Retention | 95% RH, 1000 h exposure |
